CN204738758U - Special screwed joint is used to HTHP oil gas well - Google Patents
Special screwed joint is used to HTHP oil gas well Download PDFInfo
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- CN204738758U CN204738758U CN201520452200.0U CN201520452200U CN204738758U CN 204738758 U CN204738758 U CN 204738758U CN 201520452200 U CN201520452200 U CN 201520452200U CN 204738758 U CN204738758 U CN 204738758U
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- taper
- thread
- guide surface
- gas well
- box cupling
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- 238000007789 sealing Methods 0.000 claims abstract description 39
- 230000007704 transition Effects 0.000 claims description 6
- 230000015572 biosynthetic process Effects 0.000 claims description 5
- 238000003754 machining Methods 0.000 claims description 3
- 210000002445 nipple Anatomy 0.000 claims description 2
- 150000001875 compounds Chemical class 0.000 abstract description 9
- 238000000034 method Methods 0.000 abstract description 5
- 230000008878 coupling Effects 0.000 abstract description 3
- 238000010168 coupling process Methods 0.000 abstract description 3
- 238000005859 coupling reaction Methods 0.000 abstract description 3
- 239000011324 bead Substances 0.000 abstract 3
- 238000010586 diagram Methods 0.000 description 4
- 230000002159 abnormal effect Effects 0.000 description 3
- 238000005553 drilling Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 102220498074 Transmembrane 4 L6 family member 20_N80Q_mutation Human genes 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Landscapes
- Earth Drilling (AREA)
- Non-Disconnectible Joints And Screw-Threaded Joints (AREA)
Abstract
The utility model provides a special screwed joint is used to HTHP oil gas well, includes coupling and body, connects screwed joint still to include stable structure, stable structure include the coupling the interior toper guide face that is equipped with between moment of torsion circular bead and the interior conical sealing surface and body at the toper expansion border, the outer taper surface that are equipped with in proper order between moment of torsion circular bead and the outer conical sealing surface, the outer toper guide face of body, expand to process on border and the moment of torsion circular bead and have the helical shape guiding gutter. The utility model discloses a seal structure design in the position near the screw thread, can rectify seal structure at the in -process stable structure that goes into the well, guarantee that seal structure can intactly contact. In addition, when the sleeve pipe bore compound load in the pit, stable structure made sheathed tube sealing performance can not receive the influence because of the change of bearing load, remains high sealing performance throughout.
Description
Technical field
The utility model belongs to oil exploitation drilling equipment technical field, particularly the air-tight seal connecting structure of the sleeve pipe special buckle of drilling equipment.
Background technology
HTHP Oil/gas Well is also referred to as hp-ht well, the regulation of association is promoted according to international HTHP cooperation, the formation temperature of Oil/gas Well reaches 300 °F (149 DEG C), or strata pressure reaches 15000psi(103.4Mpa), or well head pressure reaches 10000psi(68.9Mpa) more than be called hp-ht well.If the formation temperature of Oil/gas Well reaches 400 °F (204 DEG C), or strata pressure reaches 20000psi(137.8Mpa), or well head pressure reaches 15000psi(103.4Mpa), be called superhigh-temperature and-pressure well.
Land and the offshore oil and gas field ubiquity of China the problem of abnormal pressure and HTHP, and have a very wide distribution, excursion is large.Its temperature and pressure absolute value of the hp-ht well found so far is all very high, and barometric gradient can reach or exceed the overlying formation pressure gradient (i.e. 2.31g/cm2 equivalent drilling fluid density) of theoretical calculate; Geothermal gradient reaches 4 DEG C/more than 100 meters.Abnormal pressure is not only distributed in zones of different and different regions, and is extensively distributed in Different Strata.
The severe underground working of HTHP Oil/gas Well makes sleeve pipe Service Environment abnormal harsh, and this has higher requirement to the sealing performance of sleeve pipe.The sealing of the conventional round thread of API and buttress thread mainly realizes sealing by means of API thread compound, and its seal form is all tighten at screw thread to produce interference fit to basal plane screw thread, and the space between the base angle of screw thread and drift angle is filled by thread compound.This sealing means of API screw thread is used only in the oil well of less than 100 DEG C, the requirement of sealing can not be met for deep-well, ultradeep well and gas well, especially gas well at HTHP, the penetrability due to gas is better than the penetrability of liquid greatly, is easy to penetrate the thread compound in male and female thread pitch; High temperature also can reduce the viscosity of thread compound on the other hand, gas is more easily passed, causes seal failure; Even if bottom hole temperature (BHT) is in the scope of routine, the wriggling of bubble in stop-leak compound, also can break through the sealing of thread compound.Therefore, conventional API screw thread cannot reach a high temperature the seal request of high-pressure oil-gas well.
Summary of the invention
For solving the above-mentioned defect of prior art, the utility model proposes a kind of efficient sealed HTHP Oil/gas Well Special threading connector.
The technical solution of the utility model is: comprise box cupling and body, internal thread and inner conical sealing surface is provided with from outside to inside successively in described box cupling, described body end is provided with male-tapered sealing surface and external screw thread from front to back successively, and described internal thread coordinates formation to be threaded with external screw thread, described inner conical sealing surface and male-tapered sealing surface form the conical surface/conical surface sealing structure, described nipple also comprises rock-steady structure, described rock-steady structure comprises guide surface in the second taper that box cupling is provided with successively between torque shoulder and taper inner sealing surface, the conical expansion edge that in first taper, guide surface and body are provided with successively between torque shoulder and male-tapered sealing surface, male-tapered face, guide surface in described second taper, in first taper, guide surface is the different conical surface of two sections of taperings, the two forms the guide surface of double tapered, and when described body stretches in box cupling, described conical expansion edge can realize coordinating with guide surface in described second taper by guide surface in described first taper, Surface Machining in the male-tapered face of described body, conical expansion edge and torque shoulder has the guiding gutter of continuous helical shape.
Such scheme is more preferably:
Described internal and external screw thread is that double thread is connected, and thread taper may be selected to be 1:18 or 1:12 according to sleeve pipe specification difference; Bearing surface angle is-3 °, and spigot surface angle is 15 °.Adopt double thread can realize the upper fast button of screw thread; Thread taper is preferably 1:18 or 1:12, and bearing surface angle is-3 °, can improve the bonding strength of screw thread, and that especially improves screw thread meets supporting capacity; Spigot surface angle is preferably 15 °, facilitates make-up, and research shows that spigot surface angle is more not easy thread alternating more greatly.Patent of the present invention, by optimizing the fillet of spigot surface fillet and bearing surface, improves anti-stick button ability and the bonding strength of screw thread.By finite element analysis, optimize the screw thread of spigot surface and bearing surface fillet, the phenomenon concentrated of stress be improved significantly, and axial stress mainly concentrates on flank part on the lower, significantly reduces the maximum value of stress.
Described torque shoulder is the reactive torque shoulder of-15 °.Torque shoulder has protective effect to primary seal, can ensure that primary seal can play a role to greatest extent and not damage.Torque shoulder directly can also affect the contact distribution on primary sealing area, thus affects the sealing performance of joint.On joint after button, the torque shoulder of internal and external threads comes in contact, and produces larger contact, makes torque shoulder inherently have certain auxiliary seal effect.Prove through overtesting: the contact on right angle shoulder reduces rapidly with the increase of axial load, until be zero, and-15 ° of torque shoulder are after joint is subject to axial tensile loads, the decline of contact is starkly lower than right angle shoulder, illustrate under tensile load effect, the sealability of reverse shoulder is better than right angle shoulder.
The form of thread height of described box cupling is slightly larger than the form of thread height of body, and the upper button rear thread magnitude of interference is 0.13mm ~ 0.27mm.In patent of the present invention, box cupling form of thread aspect ratio body form of thread height is bigger, by optimizing the pitch diameter of thread, control the magnitude of interference that screw thread tightens, improve the upper button integrality of screw thread, simultaneously thread interference amount selects 1/3 ~ 2/3 of the API buttress thread magnitude of interference, thus make the size of sealing surface contact, the reliability of joint stress distribution and sealing all reaches best.
The tapering in described taper inner sealing surface and taper external seal face is 1:10; In described first taper, guide surface tapering is 1:16; In described second taper, guide surface tapering is 10 °; Described male-tapered face cone degree is 1:12; Described conical expansion edge tapering is 10 °.
Be provided with transition arc between described box cupling torque shoulder and guide surface, the radius of transition arc is 0.8mm.
Described box cupling torque shoulder place's internal diameter and body inner end diameter junction are designed to seamlessly transit, and can eliminate the oil gas turbulent flow in pipe, improve the anti-corrosion capability of joint.
Described guiding gutter is symmetrical two of tube surfaces.
Because the utility model adopts double thread, joint make-up speed doubles than conventional single post screw thread, not easily thread gluing in upper button process simultaneously.The design of Sealing Structure of patent of the present invention is in the position near screw thread, and in the process of going into the well, rock-steady structure can correct hermetically-sealed construction, ensures that hermetically-sealed construction can intactly contact.In addition, when down-hole casing bears combined load, rock-steady structure makes the sealing performance of sleeve pipe can not be affected because of the change of bearing load, remains high sealing performance.
Accompanying drawing explanation
Fig. 1 is the schematic diagram that is threaded of the present utility model;
Fig. 2 is seal form of the present utility model and rock-steady structure schematic diagram;
Fig. 3 is pipe structure of the present utility model and guiding gutter position view (only drawing the first half in figure, Lower Half and its symmetry);
Fig. 4 is box cupling structural representation of the present utility model;
Fig. 5 is the amplifier section structural representation of A in Fig. 4;
Fig. 6 is that the B of guiding gutter of the present utility model is to distribution schematic diagram
In figure: 1, box cupling, 1-1, internal thread, 1-2, taper inner sealing surface, guide surface in 1-3, the first taper, guide surface in 1-4, the second taper, 2, body, 2-1, external screw thread, 2-2, taper external seal face, 2-3, male-tapered face, 2-4, conical expansion edge, 3, torque shoulder, 4, guiding gutter.
Detailed description of the invention
Below in conjunction with accompanying drawing and instantiation, the utility model is described in further detail, but not as restriction of the present utility model.
Embodiment 1
A kind of HTHP Oil/gas Well Special threading connector, comprise body 2 and box cupling 1, the internal thread 1-1 being provided with taper in the external screw thread 2-1 of taper and box cupling is provided with outside body, there is tapering to be the taper inner sealing surface 1-2 of d in the rear end of coupling inner thread 1-1, guide surface 1-3 in the first taper that tapering is d1 is designed with near the position of taper inner sealing surface 1-2, be designed with guide surface 1-4 in the second taper that tapering is d2 near the position of torque shoulder, in the first taper, in guide surface 1-3 and the second taper, guide surface 1-4 forms double tapered guide surface.
Have tapering to be the taper external seal face 2-2 of d in the rear end of body external screw thread 2-1, be the male-tapered face 2-3 that tapering is d'1 after taper external seal face 2-2, d1 is less than d'1; Be processed with the conical expansion edge 2-4 that tapering is d2 between male-tapered face 2-3 and torque shoulder, conical expansion edge 2-4 and tapering on box cupling be d2 the second taper in guide surface 1-4 coordinate; Male-tapered face 2-3, the conical expansion edge 2-4 and torque shoulder 3 of body 2 are processed with two spiral guiding gutters, namely guiding gutter is continuous print helical structure, originate in the male-tapered face 2-3 of body, through the conical expansion edge 2-4 of body, end in the inside pipe wall of body torque shoulder.Article two, guiding gutter is symmetric (Fig. 6 is by the schematic diagram of body torque shoulder to direction inside body) on body, every bar guiding gutter by male-tapered towards torque shoulder around body half rotation.In the first taper on male-tapered face 2-3 on body 2, conical expansion edge 2-4, guiding gutter and box cupling 1, in guide surface 1-3 and the second taper, guide surface 1-4 together constitutes the rock-steady structure of this joint.
On internal thread 1-1 and external screw thread 2-1 after button, taper inner sealing surface 1-2 and taper external seal face 2-2 produces interference fit, and the magnitude of interference is a.Unnecessary thread compound is extruded joint by the guiding gutter on body 2, the thread compound pressure of buckle-shaped one-tenth in elimination, improves the stability of sealing.In addition guiding gutter 4 can discharge the dirts such as the mud of joint inner accumulated in the process of going into the well.
Embodiment 2
Below for casing joint, provide a kind of concrete HTHP Oil/gas Well Special threading connector, comprise body 2(sleeve pipe) and box cupling 1, body 2 is of a size of 177.8mm × 10.36mm, grade of steel N80Q, the physical dimension of body 2 comprises external diameter, wall thickness etc. and all adopts API standard gauge definite value, and material property meets API standard-required.Box cupling 1 machining internal thread 1-1, sleeve pipe 2 threading 2-1, the thread taper of box cupling 1 and sleeve pipe 2 is 1:18, and screw thread is follow-on buttress thread, and screw thread bearing surface angle is-3 °, and spigot surface angle is 15 °.The form of thread height of box cupling 1 is 1.782mm, and the form of thread height of body 2 is 1.575mm, and the upper button rear thread magnitude of interference is 0.13mm ~ 0.27mm.There is the taper inner sealing surface 1-2 of 1:10 after box cupling 1 internal thread, have tapering to be the guide structure of 1:16 near the Position Design of taper inner sealing surface 1-2, i.e. guide surface 1-3 in the first taper; Be guide surface 1-4 in the second taper after guide surface 1-3 in first taper, tapering is 10 °; Torque shoulder is the reactive torque shoulder 3 of-15 °, is provided with transition arc R between torque shoulder 3 and guide structure, and the radius of transition arc R is 0.8mm.Taper external seal face 2-2 after body 2 screw thread, the male-tapered face 2-3 of to be tapering after the 2-2 sealing surface of taper external seal face be 1:12, to be tapering after the 2-3 of male-tapered face the be conical expansion edge 2-4 of 10 °, sleeve pipe male-tapered face 2-3, conical expansion edge 2-4 and torque shoulder are processed with two spiral guiding gutters.
Above content is the further description done the utility model patent in conjunction with concrete preferred embodiment; can not assert that detailed description of the invention of the present utility model is only limitted to this; for the utility model person of an ordinary skill in the technical field; without departing from the concept of the premise utility; some simple deduction or replace can also be made, all should be considered as belonging to the utility model by submitted to claims determination scope of patent protection.
Claims (8)
1. a HTHP Oil/gas Well Special threading connector, comprise box cupling and body, internal thread and taper inner sealing surface is provided with from outside to inside successively in described box cupling, described body end is provided with taper external seal face and external screw thread from front to back successively, and described internal thread coordinates formation to be threaded with external screw thread, described taper inner sealing surface and taper external seal face form the conical surface/conical surface sealing structure, it is characterized in that: described nipple also comprises rock-steady structure, described rock-steady structure comprises guide surface in the second taper that box cupling is provided with successively between torque shoulder and taper inner sealing surface, the conical expansion edge that in first taper, guide surface and body are provided with successively between torque shoulder and male-tapered sealing surface, male-tapered face, guide surface in described second taper, in first taper, guide surface is the different conical surface of two sections of taperings, the two forms the guide surface of double tapered, and when described body stretches in box cupling, described conical expansion edge can realize coordinating with guide surface in described second taper by guide surface in described first taper, Surface Machining in the male-tapered face of described body, conical expansion edge and torque shoulder has the guiding gutter of continuous helical shape.
2. HTHP Oil/gas Well Special threading connector according to claim 1, is characterized in that: described internal and external screw thread is that double thread is connected, and thread taper may be selected to be 1:18 or 1:12 according to sleeve pipe specification difference; Bearing surface angle is-3 °, and spigot surface angle is 15 °.
3. HTHP Oil/gas Well Special threading connector according to claim 1, is characterized in that: described torque shoulder is the reactive torque shoulder of-15 °.
4. HTHP Oil/gas Well Special threading connector according to claim 1, is characterized in that: the form of thread height of described box cupling is slightly larger than the form of thread height of body, and the upper button rear thread magnitude of interference is 0.13mm ~ 0.27mm.
5. HTHP Oil/gas Well Special threading connector according to claim 1, is characterized in that: the tapering in described taper inner sealing surface and taper external seal face is 1:10; In described first taper, guide surface tapering is 1:16; In described second taper, guide surface tapering is 10 °; Described male-tapered face cone degree is 1:12; Described conical expansion edge tapering is 10 °.
6. HTHP Oil/gas Well Special threading connector according to claim 1, is characterized in that: be provided with transition arc between described box cupling torque shoulder and guide surface, the radius of transition arc is 0.8mm.
7. HTHP Oil/gas Well Special threading connector according to claim 1, is characterized in that: described box cupling torque shoulder place's internal diameter and body inner end diameter junction are designed to seamlessly transit.
8. HTHP Oil/gas Well Special threading connector according to claim 1, is characterized in that: described guiding gutter is symmetrical two of tube surfaces.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520452200.0U CN204738758U (en) | 2015-06-29 | 2015-06-29 | Special screwed joint is used to HTHP oil gas well |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520452200.0U CN204738758U (en) | 2015-06-29 | 2015-06-29 | Special screwed joint is used to HTHP oil gas well |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204738758U true CN204738758U (en) | 2015-11-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520452200.0U Withdrawn - After Issue CN204738758U (en) | 2015-06-29 | 2015-06-29 | Special screwed joint is used to HTHP oil gas well |
Country Status (1)
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| CN (1) | CN204738758U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104895508A (en) * | 2015-06-29 | 2015-09-09 | 东营市永利精工石油机械制造有限公司 | Special threaded connector for HTHP oil-gas well |
-
2015
- 2015-06-29 CN CN201520452200.0U patent/CN204738758U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104895508A (en) * | 2015-06-29 | 2015-09-09 | 东营市永利精工石油机械制造有限公司 | Special threaded connector for HTHP oil-gas well |
| CN104895508B (en) * | 2015-06-29 | 2017-05-31 | 东营市永利精工石油机械制造有限公司 | HTHP Oil/gas Well Special threading connectors |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20151104 Effective date of abandoning: 20170531 |
|
| AV01 | Patent right actively abandoned |